The scr_dump routine dumps the current contents of the virtual screen
to the file filename.
The scr_restore routine sets the virtual screen to the contents
of filename, which must have been written using scr_dump. The next
call to doupdate restores the screen to the way it looked in the dump
The scr_init routine reads in the contents of filename and uses
them to initialize the curses data structures about what the terminal
currently has on its screen. If the data is determined to be valid,
curses bases its next update of the screen on this information rather
than clearing the screen and starting from scratch. scr_init is used
after initscr or a system call to share
the screen with another process which has done a scr_dump after its
endwin call. The data is declared invalid if the terminfo capabilities
rmcup and nrrmc exist; also if the terminal has been written to
since the preceding scr_dump call.
The scr_set routine is a combination of scr_restore and
scr_init. It tells the program that the information in filename is
what is currently on the screen, and also what the program wants on the screen.
This can be thought of as a screen inheritance function.
To read (write) a window from (to) a file, use the getwin and
putwin routines [see curs_util(3X)].